I recently decided to use Virtualbox to run Ubuntu, but I get the message

this kernel required an X86-64 CPU, but only detected a i686 CPU

I've already enabled virtualization in BIOS, but that doesn't seem to work. Many other solutions suggest that I should download the 32-bit version, and not the 64-bit. I'm not sure about that though, since my computer clearly says "64-bit operating system" under systems. But I might just be mistaken.

1 Answer
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Many other solutions suggest that I should download the 32-bit version, and not the 64-bit

That's the only solution actually. Download the 32-bits and proceed per usual.

Ubuntu is detecting that your processor architecture is 32-bit (anything that starts with i and ends in 86 is 32-bits: i386, i486, i586, i686). If you have a 64-bit processor them make sure you have a 64-bit kernel installed: